Blue flame heats very efficiently and doesn't have any gas odor at all. You do have to check all the pipe joints to make sure that there are no leaks and make certain that enough fresh air is coming into the house.

Are blue flame propane heaters safe?

The Vent Free Heaters come in radiant or blue flame indoor safe wall-mountable heaters that run off of either propane or natural gas. This heater is the perfect supplemental heating solution even on the coldest days.

Are propane heaters supposed to smell?

Propane and natural gas are naturally odorless, so an odor is added that smells like rotten eggs or rotting in general. This makes it easier to detect in case of a leak. If you smell this, you could have propane or gas leaking into your home.